[Ubuntu-BD] How to setup Ubuntu/Linux server for Active Directory/Open Directory clients?

[Raihan Hasnain Rahman]

I want to setup a Linux Server (preferably Ubuntu Server) for Windows and
Mac clients. The users should be able to login using their username and
password from any Windows or Mac workstations.
I have implemented Open Directory (OS X server) before, and familiar with
Active Directory. But I have almost no idea about Unix systems. I know
there's OpenLDAP, but I need an easier solution.

Right now I need a tutorial or walkthrough which will guide me to setup the
whole system.

Thanks in advance.